According to the report, called ‘Green to the core?', Asda only sources a ‘dismal' 59% of fresh produce from the UK, and has reduced its range of organic produce by 38%.
Consumer Focus downgraded 's sustainability rating from ‘C' to ‘D', the same rating as Aldi and Lidl.
‘Shopping green should not be hard. Our survey shows that when a grocer has the will to respond to consumer pressure on green issues, this works through to the shop floor,' said report author Lucy Yates.
However, Asda has hit back at what it called an 'inaccurate and misleading' report: 'It fails to take into account so much of what Asda is doing to lead the way among supermarkets in taking action on climate change, waste and sustainability.'
Marks & Spencer and Sainsbury's are the first supermarkets to attain the ‘A' grade, while Tesco retains to ‘C' rating it was first awarded two years ago.
Waitrose was handed a ‘B' rating, while The Co-operative and Morrisons joined Tesco on a ‘C' grade.
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